graphics - How can I draw a Polyline (in WPF) without anti-aliasing?

Question

Closed. This question needs details or clarity. It is not currently accepting answers. question from:https://stackoverflow.com/questions/65713556/how-can-i-draw-a-polyline-in-wpf-without-anti-aliasing

Answer 1

The obvious candidate for having the EdgeMode set to Aliased is the DrawingVisual, but setting it seemed to make no difference:

    // This had no effect!
    RenderOptions.SetEdgeMode(dv, EdgeMode.Aliased);

DrawingVisual has a protected property VisualEdgeMode, which presumably should have been set by calling the above. During debugging, I put a watch on the property and found it was not being set!

As it's a protected property you cannot set it directly, but you can create a subclass and do it that way. In the end, this is what worked for me:

    class DrawingVisualAliased : DrawingVisual
    {
        public DrawingVisualAliased() : base()
        {
            VisualEdgeMode = EdgeMode.Aliased;
        }
    }

Not sure if this is the best way. It seems like the property should be set by calling RenderOptions.SetEdgeMode, so maybe there's something else not quite right.

Thanks to @Rekshino for pushing me to create an example. It certainly helped to be able to work on a very simplified version of the problem, with a clear visual representation of it.